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复合材料层合板低速冲击损伤模拟及凹坑深度预测

Damage Simulation of Low-Velocity Impact and Dent Depth Prediction for Composite Laminates

  • 摘要: 将准静态压痕力作用下的复合材料层合板凹坑深度-接触力公式用于低速冲击凹坑深度预测,进行了两种铺层的层合板低速冲击试验,建立了冲击有限元模型,选用应变表示的Hashin准则和界面元模拟层合板损伤失效。利用损伤面积计算冲击后层合板的整体等效刚度,代入接触力公式预测凹坑深度-冲击能量曲线,发现最大损伤面积计算结果与试验值吻合较好,在铺层数较少的情况下,凹坑深度预测值与试验值具有较高的一致性。

     

    Abstract: The relation between the contact force and dent depth under quasi-static indentation force is used to predict the dent depth of composite laminates subjected to low-velocity impact. The impact finite element model is developed, and the strain based on Hashin′s criterion and Cohesive element are used to simulate the damage of the laminates. The overall equivalent stiffness of the impact-damaged laminate is calculated by using the damage area, and two depth-energy curve is predicted by the contact force formula. It is found that the calculated results of the maximum damage area are in good agreement with the test values. The predicted dent depths agree well with the test values when the number of plies is small.

     

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